Hi,
Wmvcore.dll is a microsoft library file for Windows media player. If you are seeing this error then in all probability you do not have windows media player installed.
If it's worth installing Windoze media player in order to play Vindictus then I suggest you do so, I'm still conducting a cost benefit analysis on the matter.

微软一站式示例脚本库:
http://blogs.technet.com/b/onescript
